Problem: A chromium-plated steel bicycle handlebar is scratched. Will rusting of the iron in the steel be encouraged or retarded by the chromium? Briefly explain.Fe2+ (aq) + 2e- → Fe (s)         ε°red= -0.44 VCr3+ (aq) + 3e- → Cr (s)          ε°red= -0.74 V

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We’re being asked which of the given if the rusting of the iron in the steel be encouraged or retarded by the chromium. 


Rusting is an oxidation reaction. 


Recall the mnemonics LEO GER.

Lose               Gain

Electron         Electrons

Oxidation       Reduction


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Problem Details

A chromium-plated steel bicycle handlebar is scratched. Will rusting of the iron in the steel be encouraged or retarded by the chromium? Briefly explain.

Fe2+ (aq) + 2e- → Fe (s)         ε°red= -0.44 V

Cr3+ (aq) + 3e- → Cr (s)          ε°red= -0.74 V

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